/* ===== DESIGN SYSTEM — docs.rw inspired ===== */
:root {
  /* Dark theme (default) */
  --bg-main: #090E17;
  --bg-main-rgb: 9, 14, 23;
  --bg-sidebar: #0D1320;
  --bg-sidebar-hover: rgba(0, 216, 255, 0.06);
  --bg-sidebar-active: rgba(0, 216, 255, 0.12);
  --bg-card: rgba(15, 23, 42, 0.7);
  --bg-callout-info: rgba(0, 216, 255, 0.08);
  --border-callout-info: rgba(0, 216, 255, 0.25);
  --bg-callout-tip: rgba(16, 185, 129, 0.08);
  --border-callout-tip: rgba(16, 185, 129, 0.25);
  --bg-callout-warn: rgba(245, 158, 11, 0.08);
  --border-callout-warn: rgba(245, 158, 11, 0.25);
  --bg-callout-danger: rgba(239, 68, 68, 0.08);
  --border-callout-danger: rgba(239, 68, 68, 0.25);
  --text-main: #C8D6E5;
  --text-heading: #F1F5F9;
  --text-muted: #64748B;
  --text-sidebar: #8899A6;
  --text-sidebar-hover: #F1F5F9;
  --text-accent: #00D8FF;
  --border-color: rgba(255, 255, 255, 0.07);
  --accent: #00D8FF;
  --accent-hover: #38BDF8;
  --accent-glow: rgba(0, 216, 255, 0.15);
  --code-bg: #0C1222;
  --sidebar-width: 260px;
  --header-height: 56px;
  --content-max-width: 820px;
  --grid-color: rgba(255, 255, 255, 0.03);
  color-scheme: dark light;
}

[data-theme="light"] {
  --bg-main: #FFFFFF;
  --bg-main-rgb: 255, 255, 255;
  --bg-sidebar: #F8FAFC;
  --bg-sidebar-hover: rgba(0, 0, 0, 0.04);
  --bg-sidebar-active: rgba(0, 150, 200, 0.08);
  --bg-card: #F1F5F9;
  --bg-callout-info: #EFF6FF;
  --border-callout-info: #BFDBFE;
  --bg-callout-tip: #F0FDF4;
  --border-callout-tip: #BBF7D0;
  --bg-callout-warn: #FFFBEB;
  --border-callout-warn: #FDE68A;
  --bg-callout-danger: #FEF2F2;
  --border-callout-danger: #FECACA;
  --text-main: #334155;
  --text-heading: #0F172A;
  --text-muted: #64748B;
  --text-sidebar: #475569;
  --text-sidebar-hover: #0F172A;
  --text-accent: #0284C7;
  --border-color: #E2E8F0;
  --accent: #0284C7;
  --accent-hover: #0369A1;
  --accent-glow: rgba(2, 132, 199, 0.1);
  --code-bg: #1E293B;
  --grid-color: rgba(0, 0, 0, 0.03);
}

/* TG WebApp overrides */
body.tg-webapp {
  --bg-main: var(--tg-theme-bg-color, #090E17);
  --text-main: var(--tg-theme-text-color, #C8D6E5);
  --bg-sidebar: var(--tg-theme-secondary-bg-color, #0D1320);
  --accent: var(--tg-theme-button-color, #00D8FF);
  --text-muted: var(--tg-theme-hint-color, #64748B);
}

/* ===== BASE ===== */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0; padding: 0;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.7; font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Grid background */
  background-image:
    repeating-linear-gradient(0deg, var(--grid-color) 0px, var(--grid-color) 1px, transparent 1px, transparent 80px),
    repeating-linear-gradient(90deg, var(--grid-color) 0px, var(--grid-color) 1px, transparent 1px, transparent 80px),
    radial-gradient(ellipse at 15% 10%, var(--accent-glow), transparent 50%),
    radial-gradient(ellipse at 85% 30%, rgba(99, 102, 241, 0.08), transparent 50%);
  background-attachment: fixed;
}

body.tg-desktop {
  max-width: 800px; margin: 0 auto;
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  min-height: 100vh;
}

/* ===== STICKY HEADER (desktop + mobile) ===== */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-height); padding: 0 24px;
  background: rgba(var(--bg-main-rgb), 0.8);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky; top: 0; z-index: 100;
}

.mobile-header {
  display: none; align-items: center; justify-content: space-between;
  height: var(--header-height); padding: 0 16px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(var(--bg-main-rgb), 0.9);
  backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 40;
}

.mobile-title {
  font-weight: 600; font-size: 1rem;
  color: var(--text-heading);
  display: flex; align-items: center; gap: 8px;
}

.mobile-title img { height: 24px; border-radius: 6px; }

.icon-btn {
  background: none; border: none;
  color: var(--text-muted); cursor: pointer;
  padding: 8px; display: flex; align-items: center; justify-content: center;
  transition: color 0.2s; font-size: 1.1rem;
}
.icon-btn:hover { color: var(--text-heading); }

/* ===== LAYOUT ===== */
.gitbook-layout { display: flex; min-height: 100vh; }

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sidebar-width); flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  height: 100vh; position: sticky; top: 0;
  display: flex; flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: 20px 16px 12px;
  display: flex; flex-direction: column; gap: 12px;
}

.sidebar-header h2 {
  margin: 0; font-size: 1rem; font-weight: 600;
  color: var(--text-heading);
  display: flex; align-items: center; gap: 8px;
}
.sidebar-header h2 img { height: 28px; border-radius: 6px; }

/* Search */
.search-container { position: relative; }

.search-container input {
  width: 100%; padding: 8px 12px 8px 32px;
  background: rgba(var(--bg-main-rgb), 0.5);
  border: 1px solid var(--border-color);
  border-radius: 6px; color: var(--text-main);
  font-size: 0.85rem; box-sizing: border-box;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-container input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}
.search-container::before {
  content: "🔍"; position: absolute;
  left: 10px; top: 50%; transform: translateY(-50%);
  font-size: 12px; opacity: 0.5;
}

.search-results {
  display: none; position: absolute;
  top: calc(100% + 4px); left: 0; right: 0;
  background: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: 8px; box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  max-height: 350px; overflow-y: auto; z-index: 50;
}
.search-results.active { display: block; }

.search-result-item {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  text-decoration: none; display: block;
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--bg-sidebar-hover); }
.search-result-title { color: var(--accent); font-weight: 500; font-size: 0.9rem; margin-bottom: 2px; }
.search-result-snippet {
  color: var(--text-muted); font-size: 0.78rem;
  overflow: hidden; text-overflow: ellipsis;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}

/* Sidebar Nav */
.sidebar-nav {
  flex: 1; overflow-y: auto;
  padding: 0 8px 24px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.08) transparent;
}

.nav-group { margin-bottom: 20px; }

.nav-group-title {
  font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.08em; font-weight: 600;
  color: var(--text-muted); margin: 0 0 8px 12px;
}

.nav-subgroup { margin-bottom: 2px; }
.nav-subgroup-title {
  font-size: 0.9rem; font-weight: 500;
  color: var(--text-heading);
  padding: 6px 12px; display: flex; align-items: center; gap: 6px;
  cursor: pointer; border-radius: 6px;
  transition: background 0.15s;
}
.nav-subgroup-title:hover { background: var(--bg-sidebar-hover); }

.nav-subgroup-items {
  margin-left: 12px;
  border-left: 1px solid var(--border-color);
  padding-left: 8px; margin-top: 2px; margin-bottom: 6px;
}

.nav-item {
  display: block; padding: 5px 12px;
  color: var(--text-sidebar);
  text-decoration: none; font-size: 0.88rem;
  border-radius: 6px; transition: all 0.15s;
  line-height: 1.4; margin-bottom: 1px;
}
.nav-item:hover { color: var(--text-sidebar-hover); background: var(--bg-sidebar-hover); }
.nav-item.active {
  color: var(--accent); background: var(--bg-sidebar-active);
  font-weight: 500;
}

/* ===== MAIN CONTENT ===== */
.main-content {
  flex: 1; min-width: 0;
  display: flex; justify-content: center;
}

.content-wrapper {
  max-width: 1100px; width: 100%;
  margin: 0 auto; padding: 32px 40px 80px;
  display: flex; gap: 40px;
}

.content-body { flex: 1; min-width: 0; max-width: var(--content-max-width); }

/* ===== BREADCRUMBS ===== */
.breadcrumbs {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.82rem; margin-bottom: 8px; flex-wrap: wrap;
}
.breadcrumbs a { color: var(--text-muted); text-decoration: none; transition: color 0.15s; }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs .breadcrumb-current {
  background: rgba(0, 216, 255, 0.1);
  color: var(--accent); padding: 2px 10px;
  border-radius: 12px; font-weight: 500;
}
.breadcrumbs .breadcrumb-sep { color: var(--text-muted); opacity: 0.4; }

/* ===== TOC (Right Sidebar) ===== */
.page-toc {
  width: 220px; flex-shrink: 0;
  position: sticky; top: 32px; align-self: flex-start;
  max-height: calc(100vh - 64px); overflow-y: auto;
  padding: 16px; border: 1px solid var(--border-color);
  border-radius: 8px; background: var(--bg-card);
  display: none;
}
@media (min-width: 1200px) { .page-toc { display: block; } }

.page-toc-title {
  font-size: 0.75rem; text-transform: uppercase;
  font-weight: 600; color: var(--text-muted);
  margin-bottom: 10px; letter-spacing: 0.06em;
}

.toc-link {
  display: block; font-size: 0.82rem;
  color: var(--text-muted); text-decoration: none;
  margin-bottom: 6px; line-height: 1.4;
  transition: color 0.15s;
  border-left: 2px solid transparent;
  padding-left: 10px; margin-left: -1px;
}
.toc-link:hover { color: var(--text-sidebar-hover); }
.toc-link.active { color: var(--accent); border-left-color: var(--accent); font-weight: 500; }
.toc-h3 { padding-left: 20px; font-size: 0.78rem; }

/* ===== MARKDOWN BODY ===== */
.markdown-body { font-size: 16px; color: var(--text-main); word-wrap: break-word; }

.markdown-body h1 {
  font-size: 2.2rem; font-weight: 700;
  margin: 0 0 1.2rem; color: var(--text-heading); line-height: 1.2;
}
.markdown-body h2 {
  font-size: 1.5rem; font-weight: 600;
  margin: 2.5rem 0 1rem; padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-heading);
}
.markdown-body h3 {
  font-size: 1.2rem; font-weight: 600;
  margin: 2rem 0 0.8rem; color: var(--text-heading);
}
.markdown-body p { margin-top: 0; margin-bottom: 1.2rem; }

.markdown-body a { color: var(--accent); text-decoration: none; font-weight: 500; }
.markdown-body a:hover { text-decoration: underline; }

.markdown-body ul, .markdown-body ol { margin-top: 0; margin-bottom: 1.2rem; padding-left: 1.5rem; }
.markdown-body li { margin-bottom: 0.4rem; }

/* Images — RESPONSIVE */
.markdown-body img {
  max-width: 100%; height: auto;
  border-radius: 8px; border: 1px solid var(--border-color);
  display: block; margin: 1rem 0;
}

/* Code */
.markdown-body code {
  background: var(--bg-card); padding: 0.15em 0.4em;
  border-radius: 4px; font-size: 85%;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  color: var(--accent);
}
.markdown-body pre {
  background: var(--code-bg); padding: 16px;
  border-radius: 8px; overflow-x: auto;
  margin-bottom: 1.5rem; color: #E2E8F0;
  border: 1px solid var(--border-color);
  position: relative;
}
.markdown-body pre code {
  background: transparent; padding: 0;
  color: inherit; font-size: 14px;
}

/* Callouts */
.callout {
  margin: 1.5rem 0; padding: 16px 16px 16px 48px;
  border-left: 3px solid var(--border-color);
  border-radius: 0 8px 8px 0;
  background: var(--bg-card); color: var(--text-main);
  position: relative;
}
.callout::before {
  position: absolute; left: 14px; top: 16px; font-size: 1.1rem;
}
.callout p:last-child { margin-bottom: 0; }
.callout-title { font-weight: 600; margin-bottom: 4px; display: block; }

.callout.info { background: var(--bg-callout-info); border-left-color: var(--accent); }
.callout.info::before { content: "ℹ️"; }
.callout.tip { background: var(--bg-callout-tip); border-left-color: #10B981; }
.callout.tip::before { content: "💡"; }
.callout.warning { background: var(--bg-callout-warn); border-left-color: #F59E0B; }
.callout.warning::before { content: "⚠️"; }
.callout.danger { background: var(--bg-callout-danger); border-left-color: #EF4444; }
.callout.danger::before { content: "🚨"; }
.callout.note { background: var(--bg-callout-info); border-left-color: var(--accent); }
.callout.note::before { content: "📝"; }

/* Fallback: style raw blockquotes nicely too */
.markdown-body blockquote {
  margin: 1.5rem 0; padding: 12px 16px;
  border-left: 3px solid var(--border-color);
  background: var(--bg-card); border-radius: 0 8px 8px 0;
  color: var(--text-main);
}
.markdown-body blockquote p:last-child { margin-bottom: 0; }

/* Photo Slider */
.photo-slider { margin: 1.5rem 0; }
.slider-main {
  text-align: center; margin-bottom: 12px;
  background: var(--bg-card); border-radius: 10px;
  padding: 12px; border: 1px solid var(--border-color);
}
.slider-main img {
  max-height: 420px; width: auto; max-width: 100%;
  object-fit: contain; border-radius: 6px;
  border: none;
}
.slider-thumbnails {
  display: flex; gap: 8px; overflow-x: auto;
  padding-bottom: 4px; scrollbar-width: none;
}
.slider-thumbnails::-webkit-scrollbar { display: none; }
.slider-thumb {
  height: 56px; width: auto; cursor: pointer;
  border: 2px solid transparent; border-radius: 6px;
  opacity: 0.45; transition: all 0.2s; flex-shrink: 0;
}
.slider-thumb:hover { opacity: 0.75; }
.slider-thumb.active { opacity: 1; border-color: var(--accent); }

/* Tables */
.markdown-body table { width: 100%; border-collapse: collapse; margin-bottom: 1.5rem; }
.markdown-body th, .markdown-body td {
  padding: 10px 14px; border-bottom: 1px solid var(--border-color); text-align: left;
}
.markdown-body th { font-weight: 600; color: var(--text-heading); background: var(--bg-card); }

/* ===== PAGINATION ===== */
.page-nav-wrapper {
  display: flex; justify-content: space-between;
  margin-top: 3rem; padding-top: 1.5rem;
  border-top: 1px solid var(--border-color); gap: 1rem;
}
.page-nav {
  flex: 1; display: flex; flex-direction: column;
  padding: 16px 20px;
  border: 1px solid var(--border-color); border-radius: 8px;
  text-decoration: none; transition: all 0.2s;
  background: var(--bg-card);
}
.page-nav:hover { border-color: var(--accent); box-shadow: 0 0 12px var(--accent-glow); }
.page-nav.next { align-items: flex-end; text-align: right; }
.page-nav.prev { align-items: flex-start; text-align: left; }
.page-nav-direction {
  font-size: 0.8rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 4px;
}
.page-nav-title { font-size: 1rem; color: var(--accent); font-weight: 500; }

/* Page Footer */
.page-footer {
  margin-top: 2rem; padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex; justify-content: center;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 20px; font-size: 0.9rem; font-weight: 500;
  border-radius: 8px; cursor: pointer; transition: all 0.2s;
  text-decoration: none; border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #6366F1);
  color: white !important;
}
.btn-primary:hover { box-shadow: 0 4px 16px var(--accent-glow); transform: translateY(-1px); }

/* Copy Button */
.copy-btn {
  position: absolute; top: 8px; right: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: #94A3B8; border-radius: 4px;
  padding: 3px 8px; font-size: 12px; cursor: pointer;
  opacity: 0; transition: opacity 0.2s;
}
.markdown-body pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: rgba(255,255,255,0.15); color: #FFF; }

/* Sidebar Overlay */
.sidebar-overlay {
  display: none; position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6); z-index: 45;
  backdrop-filter: blur(4px);
}

/* Language Dropdown */
.lang-dropdown { position: relative; display: inline-block; }
.lang-menu {
  display: none; position: absolute;
  right: 0; top: 100%;
  background: var(--bg-sidebar);
  min-width: 120px; box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  border-radius: 8px; border: 1px solid var(--border-color);
  z-index: 100; padding: 6px 0;
}
.lang-dropdown:hover .lang-menu { display: block; }
.lang-menu a {
  color: var(--text-main); padding: 6px 14px;
  text-decoration: none; display: block; font-size: 0.85rem;
}
.lang-menu a:hover { background: var(--bg-sidebar-hover); color: var(--accent); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .content-wrapper { gap: 20px; padding: 24px 24px 60px; }
}

@media (max-width: 768px) {
  .mobile-header { display: flex; }
  .gitbook-layout { flex-direction: column; }
  .sidebar {
    position: fixed; left: -100%; top: 0; bottom: 0;
    z-index: 50; width: 85%; max-width: 300px;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 4px 0 20px rgba(0,0,0,0.3);
  }
  .sidebar.open { left: 0; }
  .sidebar-overlay.open { display: block; }
  .content-wrapper { padding: 20px 16px 60px; }
  .markdown-body h1 { font-size: 1.6rem; }
  .markdown-body h2 { font-size: 1.25rem; }
  .slider-main img { max-height: 280px; }
  .slider-thumb { height: 44px; }
  .page-nav-wrapper { flex-direction: column; }
  .page-toc { display: none !important; }
}

@media (max-width: 480px) {
  .content-wrapper { padding: 16px 12px 48px; }
  .markdown-body h1 { font-size: 1.4rem; }
  .slider-main { padding: 8px; }
}